1．Interaction between light and semiconductor quantum nanostructures
Floquet states are electronic systems driven by strong CW THz laser form photodressed electron states.
We develop new quantum many-body methods dealing with these photodressed particles as fundamental quasi-particles, and explore new pnotoinduced phenomena.
In particular, we study dynamic correlation and non-equilibrium quantum dynamics induced by correlation effect and
interband photo-excitation of composite particle system (exciton, charged exciton, exciton molecule, etc.).
[K.Hino, X. M. Tong and N. Toshima,“Interacting dynamic Wannier-Stark ladder driven by a periodic pulse train”, Phys. Rev. B 77, 045322_1-19 (2008)]
|Quasienergies of electron-hole joint band of laser-driven semiconductor superlattice(a)with exciton effect(b)without exciton effect.||(a)Time-Delay spectrum and (b)Pondermotive potential energy at Ponderomotive radius 50 (a.u.) of dynamic Wannier-Stark ladder electron.|
2．Photoinduced phase transition in strongly correlated electron system
We study photoinduced phenomena in strongly correlated electron systems listed below.